diff --git a/src/gd.c b/src/gd.c
index 87f52f5..dcfd63b 100644
--- a/src/gd.c
+++ b/src/gd.c
@@ -1610,6 +1610,7 @@ BGD_DECLARE(void) gdImageFilledArc (gdImagePtr im, int cx, int cy, int w, int h,
     {
       e += 360;
     }
+
   for (i = s; (i <= e); i++)
     {
       int x, y;
@@ -3456,10 +3457,10 @@ static void gdImageAALine (gdImagePtr im, int x1, int y1, int x2, int y2, int co
 
 	/* Axis aligned lines */
 	if (dx == 0) {
-		gdImageHLine(im, y1, x1, x2, col);
+		gdImageVLine(im, x1, y1, y2, col);
 		return;
 	} else if (dy == 0) {
-		gdImageVLine(im, x1, y1, y2, col);
+		gdImageHLine(im, y1, x1, x2, col);
 		return;
 	}
 
diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index 71a28f8..8bce8ff 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -28,6 +28,7 @@ if (BUILD_TEST)
 
 	SET(TESTS_DIRS
 		gdtest
+		gdimagearc
 		gdimagecolorclosest
 		gdimagecolorexact
 		gdimagecolorresolve
@@ -50,4 +51,4 @@ if (BUILD_TEST)
 	FOREACH(test_dir ${TESTS_DIRS})
 		add_subdirectory (${test_dir})
 	ENDFOREACH(test_dir)
-endif (BUILD_TEST)
\ No newline at end of file
+endif (BUILD_TEST)
diff --git a/src/tests/gdimagearc/CMakeLists.txt b/src/tests/gdimagearc/CMakeLists.txt
new file mode 100644
index 0000000..3ef4fcf
--- /dev/null
+++ b/src/tests/gdimagearc/CMakeLists.txt
@@ -0,0 +1,9 @@
+SET(TESTS_FILES
+	bug00079
+)
+
+FOREACH(test_name ${TESTS_FILES})
+	add_executable(${test_name} "${test_name}.c")
+	target_link_libraries (${test_name} gdTest ${GD_LIB})
+	ADD_TEST(${test_name} ${EXECUTABLE_OUTPUT_PATH}/${test_name})
+ENDFOREACH(test_name)
diff --git a/src/tests/gdimagearc/bug00079.c b/src/tests/gdimagearc/bug00079.c
new file mode 100644
index 0000000..b643143
--- /dev/null
+++ b/src/tests/gdimagearc/bug00079.c
@@ -0,0 +1,26 @@
+#include "gd.h"
+#include "gdtest.h"
+
+int main()
+{
+	gdImagePtr im;
+	FILE *fp;
+	int error = 0;
+	char path[1024];
+
+
+	im = gdImageCreateTrueColor(300, 300);
+	gdImageFilledRectangle(im, 0,0, 299,299, 0xFFFFFF);
+
+	gdImageSetAntiAliased(im, 0x000000);
+	gdImageArc(im, 300, 300, 600,600, 0, 360, gdAntiAliased);
+
+	sprintf(path, "%s/gdimagearc/bug00079_exp.png", GDTEST_TOP_DIR);
+	if (!gdAssertImageEqualsToFile(path, im)) {
+		printf("%s failed\n", path);
+		error = 1;
+	}
+
+	gdImageDestroy(im);
+	return error;
+}
diff --git a/src/tests/gdimagearc/bug00079_exp.png b/src/tests/gdimagearc/bug00079_exp.png
new file mode 100644
index 0000000..1abfbbf
Binary files /dev/null and b/src/tests/gdimagearc/bug00079_exp.png differ